<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Title</title>
</head>
<body>

<div id="app">
  <h2>{{message}}</h2>
  <h2>{{message}},李银河</h2>
  <h2>{{firstName + lastName}}</h2>
  <h2>{{firstName + " " + lastName}}</h2>
  <h2>{{counter * 2}}</h2>
</div>

<script src="../js/vue.js"></script>
<script>
  const app = new Vue({
    el: '#app',
    data: {
      message: '你好啊',
      firstName: 'Kobe',
      lastName: 'Bryant',
      counter: 100

    }
  })
</script>
</body>
</html>
